A regimental combat team is a provisional major infantry unit which has seen use by branches of the United States Armed Forces. It is formed by augmenting a regular infantry regiment with smaller comb
107TH REGIMENTAL COMBAT TEAM SSI
111TH REGIMENTAL COMBAT TEAM
157TH REGIMENTAL COMBAT TEAM SSI
163RD REGIMENTAL COMBAT TEAM SSI
Pentomic was a structure for infantry and airborne divisions adopted by the US Army between 1957 and 1963 in response to the potential use of tactical nuclear weapons on future battlefields. It was in
1960 Pentomic Infantry Division. The five "Battle Groups" on the left of the diagram dominate the Divisional structure.